Chapter 8

Question 1

What is Akinotopsia? (Causes and where in brain)

Answer 1

Difficulty perceiving motion

Causes:
-brain injury
-neurodegenerative disease
-epilepsy

Where?
Temparo - Parieto - occipital Junction

Question 2

What function does movement serve?

Answer 2

Organizing function

Smaller units become larger units

Question 3

What is biological movement?

Answer 3

All anatomical parts of an animal move together with coordination

Question 4

What is an event?

Answer 4

Segment of time perceived to have a beginning and end

Question 5

What is an event boundary?

Answer 5

When one event ends and next begins
(Likely to occur with speed/acceleration of movement)

Question 6

Explain how Social cues are linked to movement

Answer 6

-light on ppl in dark

-point light walkers
(Little shapes and story)

Question 7

Explain the two types of motion (real and illusory)?

Answer 7

Real: actually happens

Illusory: brain assumes motion

Question 8

Explain the three types of illusory motion (apparent, induced, and motion aftereffects)

Answer 8

Apparent: no actual motion between stimuli (film, animation etc)

Induced: large object (clouds) moving causes smaller object (moon) to appear like it’s moving

Motion aftereffects: viewing a moving stimulus causes a stationary stimulus to appear like it’s moving (waterfall illusion)

Question 9

Does our brain react the same with real and illusory motion?

Answer 9

Same parts are activated, just a little less with illusory

So yea more or less

Question 10

What is the ecological approach to motion perception?

Answer 10

Looking for environmental info for perception

Information is out in the environement

Question 11

Explain three signals of collory discharge theory (image displacement, motor signal, and collory discharge)

Answer 11

1. Image displacement: when image moves across retina
2. Motor signal: signal from motor area to eyes to make them move
3. Collory signal: copy of motor signal

Question 12

Explain the collory example (dude walking)

Answer 12

Needs one (image or collory) to perceive motion
If more= no motion
If less=no motion

Dude walks and she follows him with eyes
One signal (collory)

Dude walks and doesn’t follow
One signal (image)

Scans room for dude
Two signals - no motion

Question 13

Explain the Reichardt detector

Answer 13

Something happens to receptor A then B

Delay unit= slows signal from A as they travel to output

Output multiplies both A and B as info reaches at around same time

Creates perception of motion

Question 14

Explain the middle temporal area and the moving dot experiments

Answer 14

Moving dots with more coherence=
1. Judged direction more accurately
2. More activity in MT